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Having been in the computer industry for eons :) I can tell you that it's common consideration from us geeks that if you are putting everything in CAPS that it's like shouting. Impolite at best, makes you look stupid at the worst.
After reading this, I realized inappropriate use of caps seems immature, rude or uneducated. THIS SEEMS LIKE SHOUTING wHiLe ThIS seEmS like gRAfiTTi. Neither one would give you credibility so I can understand how it would affect SEO.